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Salmon, Tuna, Sardines

Secret Ingredient: Omega-3 fatty acids

How they
work: By altering levels of a hormone called leptin in your body.
Several recent studies suggest that leptin directly influences your metabolism, determining whether you burn calories or store them as fat.

Researchers
at the University of Wisconsin found that mice with low leptin levels
have faster metabolisms and are able to burn fat more quickly than
animals with higher leptin levels. The best way to lower your leptin?
Eat fish.

Mayo Clinic researchers studying the diets of
two African tribes-one of which frequently ate fish and one of which
didn't-found that fish eaters had leptin levels nearly five times lower
than the levels found in tribes that primarily ate vegetables.

The
good news, if you don't like fish: Fish-oil supplements may work just
as well as the stuff with scales. French researchers found that men who
replaced 6 grams of fat in their diets with 6 grams of fish oil were
able to boost their metabolisms and lose an average of 2 pounds in just
12 weeks.